What might seem intuitive is to have a mixed strategy of 75% heads and 25% tails. Maybe something like 'flip an unbiased coin twice and bet tails if you get tails twice and heads for any other outcome'. What result will that give you?

There are four possibilities here:

- Coin lands on heads and you bet heads (75%*75% = 56.25% of the time)
- Coin lands on heads and you bet tails (75%*25% = 18.75% of the time)
- Coin lands on tails and you bet heads (25%*75% = 18.75% of the time)
- Coin lands on tails and you bet tails (25%*25% = 6.25% of the time)

1 and 4 are winning situations, so you'll win 62.5% of the time this way (just sum the 1 and 4 win rates).

You might immediately notice that 62.5% is less than 75%. What if you just always bet heads? Filling out the same list as above:

- Coin lands on heads and you bet heads (75%*100% = 75% of the time)
- Coin lands on heads and you bet tails (75%*0% = 0% of the time)
- Coin lands on tails and you bet heads (25%*100% = 25% of the time)
- Coin lands on tails and you bet tails (25%*0% = 0% of the time)

1 and 4 are winning situations, so you'll win 75% of the time this way. In this situation, the general win rate is:

(coin bias*head bet percentage) + [(1 - coin bias)*(1 - head bet percentage)] = win rate

(coin bias*head bet percentage) + [(1 - coin bias)*(1 - head bet percentage)] = win rate

We want to maximize this. Using b for 'coin bias' and h for 'heat bet percentage':

b*h + (1 - b)*(1 - h) = win rate

b*h + 1 - h - b + b*h = win rate

2*b*h + 1 - h - b = win rate

h*(2*b - 1) + 1 - b = win rate

At this point, we have an equation for a line. Win rate vs h is a line with a slope of 2*b - 1 and an x-intercept of 1 - b. Anytime 2*b - 1 is positive, this line will go up and to the right so h = 1 is the best bet (heads 100% of the time). Anytime 2*b - 1 is negative, h = 0 is the best bet (tails 100% of the time). 2*b - 1 is positive whenever b is greater than 0.5. Thus, the optimal strategy here is bet in the direction of the bias 100% of the time when you have a known, biased coin.

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